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Stock Options and Other Stock Based Compensation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award      
Shares available for grants under the plans 8,892,000    
Compensation cost for all grants of shares and units $ 15 $ 21 $ 11
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award      
Number of options may be exercised in whole or in part during the first year after the date granted 56,000    
Stock Options | Shares granted to employees after March 21, 2005      
Share-based Compensation Arrangement by Share-based Payment Award      
Number of options may be exercised in whole or in part during the first year after the date granted 0    
Percentage of options exercisable per year beginning on the first anniversary from date of option granted 25.00%    
Options expiration period 7 years    
Stock Options | Shares granted to employees after March 21, 2005 | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award      
Fair value of options, amortization period 1 year    
Stock Options | Shares granted to employees after March 21, 2005 | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award      
Fair value of options, amortization period 4 years